Which of the following solutions would have the highest [H3O+]? Assume that they are all 0.10 M in acid at 25∘C. The acid is followed by its Ka value. C) HNO2, 4.6 × 10-4 B) HCN, 4.9 × 10-10 E) HClO2, 1.1 × 10-2 A) HF, 3.5 × 10-4 D) HCHO2, 1.8 × 10-4

Answer : The solution that has highest hydronium ion concentration is, (B) HCN,

Explanation :

As we know that:

And,

pH : It is defined as the negative logarithm of hydrogen ion or hydronium ion concentration.

From this we conclude that, as the value of (dissociation constant) increases then the value of hydrogen ion concentration also increases and the value of pH decreases.

That means, higher value of has lower pH and lower value of

Hence, the solution that has highest hydronium ion concentration is, (B) HCN,

law of conservation of matter